CN112701435A - Coaxial TE based on angular period matching01Modal power combiner/divider - Google Patents
Coaxial TE based on angular period matching01Modal power combiner/divider Download PDFInfo
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Abstract
The invention discloses a coaxial TE based on angular cycle matching01A module power synthesis/distribution device belongs to the technical field of millimeter wave power synthesis/distribution. The device comprises a coaxial input waveguide, wherein N transition waveguide structures are arranged on the outer side wall of the coaxial input waveguide, and the other end of each transition waveguide structure is connected with a standard rectangular waveguide; n fan-shaped grooves are dug in the outer wall of the coaxial waveguide inner conductor, N fan-shaped blocks are further arranged on the outer wall of the coaxial input waveguide inner conductor, and the fan-shaped blocks are arranged in the center positions of the two adjacent fan-shaped grooves. The invention further reduces the insertion loss and improves the isolation among all branches by adopting a new matching structure, and has the greatest characteristic of improving the mode stability in large-size coaxial waveguides, thereby being beneficial to the stability of the performance of any multi-path coaxial power divider/synthesizer; meanwhile, the whole device adopts an all-metal structure, and high-power synthesis/distribution can be realized.
Description
Technical Field
The invention belongs to the technical field of millimeter wave power synthesis/distribution, and particularly relates to a coaxial radial power synthesis/distribution device.
Background
Compared with the traditional electric vacuum device, the semiconductor device has the advantages of small size, light weight, low power supply voltage, high reliability and the like, so in recent years, researchers have intensively studied the semiconductor device from the aspects of materials, processes, structures and the like so as to improve the output power of a single solid-state device. However, so far, in the millimeter wave band, the output power of a single solid-state device is still very limited, and the requirement of a high-power system is far from being met. In order to obtain a desired high power output, it is necessary to combine a plurality of output powers, and thus, the power divider/combiner is an important device in a high power system, and there are many transmission lines for implementing the power divider/combiner, including microstrip lines, coplanar waveguides, coaxial lines, waveguides, and the like. In the Ka band and higher, compared with other transmission lines, the waveguide has no dielectric loss, has lower conductor loss, and has a high power capacity characteristic, thereby being widely researched.
Waveguide spatial power combining has various forms, including binary tree multilevel power combining, waveguide chain power combining, and waveguide radial power combining. For the traditional binary power synthesis or chain synthesis, when the number of power synthesis paths is large, the path loss is rapidly increased, and the power distribution/synthesis network is large and complex. The radial power combining structure generally has a uniform feed structure to excite a desired uniform mode of an exciter in an axially symmetric transmission line through which power signals are input to respective ports, and the common symmetric transmission line structure is composed of a radial waveguide, a tapered waveguide, a circular waveguide, and a coaxial waveguide. The outstanding advantage of this result is that the power combining/allocating is done in one go, and the path loss is theoretically independent of the number of power combining paths. Meanwhile, the axisymmetric structure and the uniform working mode can ensure the excellent amplitude and phase consistency of the output port signals.
Power distribution/synthesisThe power divider is used as an important device in a feed network, and with the continuous increase of antenna array units, the compactness of a system is realized while the requirement of the continuously increased array units on the number of feed circuits is met by any multi-path power divider/combiner. Invention patent' TE based on coaxial waveguide01A power divider/combiner is disclosed in the application No. 20201056409. X, which has a cutoff frequency determined by the difference between the inner and outer radii of the coaxial waveguide, so that increasing the inner and outer radii of the coaxial waveguide simultaneously can be realized based on the coaxial TE01Any multipath radial power divider of the modulus. However TE01The mode is not the main mode of the coaxial waveguide, the required mode needs to be excited effectively and other modes need to be suppressed, and the stability of the mode in the coaxial waveguide is worse and worse as the inner radius and the outer radius are increased, thereby affecting the performance of the power divider/combiner.
Disclosure of Invention
The invention provides a large-size coaxial TE (TE) aiming at the problem of insufficient mode stability of a coaxial power divider/synthesizer under the condition of large size01The mode power divider/synthesizer achieves the purposes of reducing the insertion loss of any multi-path power divider/synthesizer, improving the isolation between branches to a certain degree and solving the mode stability in a large-size coaxial mode through a designed matching structure.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
coaxial TE based on angular cycle matching01The mode power divider/synthesizer comprises a coaxial input waveguide, N transition waveguide structures and N standard rectangular waveguides, wherein N is more than or equal to 2; one end of the coaxial input waveguide is used as an input/output port, and the other end of the coaxial input waveguide is provided with N transition waveguide structures at equal intervals along the side wall; the N transition waveguide structures have the same size, and the other end of each transition waveguide structure is connected with a standard rectangular waveguide; the N standard rectangular waveguides are used as N output/input ports; the coaxial waveguide is characterized in that N fan-shaped grooves with the same size are hollowed in the outer wall of the inner conductor of the coaxial waveguide, the N fan-shaped grooves correspond to the N transition waveguide structures one by one, and each fan-shaped groove corresponds to one transition waveguide structureThe symmetry plane of each fan-shaped groove is superposed with the symmetry plane of the corresponding transition waveguide structure.
Furthermore, the outer wall of the inner conductor of the coaxial input waveguide is provided with N fan-shaped blocks, and the fan-shaped blocks are arranged at the central positions of two adjacent fan-shaped grooves.
Furthermore, a bottom surface of the sector block close to the input/output port of the coaxial input waveguide is connected with a transition structure for smoothly transitioning the bottom surface of the sector block to the inner conductor of the coaxial input waveguide, and the section of the transition structure in the radial direction is a right-angled triangle.
Further, the central angle theta corresponding to the fan-shaped groove1The value range of (a) is 160 DEG/N +/-2 DEG, theta1The value of (A) is reduced along with the increase of the number of paths, the height of the fan-shaped groove is 0.85 lambda-0.96 lambda, the thickness of the fan-shaped groove is 0.45 lambda-0.55 lambda, and lambda is the working wavelength.
Further, the central angle theta of the fan-shaped block corresponds to3The value range is 80 DEG/N +/-2 DEG and theta2The value of (A) is also reduced along with the increase of the number of the paths, the height of the fan-shaped block is 0.85 lambda-0.96 lambda, and the thickness of the fan-shaped block is 0.2 lambda-0.25 lambda.
Further, the height of the transition structure is 0.2 lambda-0.3 lambda.
Further, the axial length of the coaxial input waveguide is larger than 1 lambda, and the inner radius of the coaxial input waveguide is smaller than the outer radius by 0.5 lambda to 0.55 lambda.
Furthermore, the arc length of the connecting port of the transition waveguide structure and the coaxial input waveguide is 0.86 lambda-0.96 lambda, and the axial distance between two adjacent transition waveguide structures is 1.19 lambda-1.59 lambda.
Further, the rectangular waveguide has a length of at least 2 λ.
Further, the transition waveguide structure adopts a straight-side trapezoidal waveguide, a curved-side trapezoidal waveguide or a step waveguide.
Compared with the prior art, the invention has the following beneficial effects.
According to the invention, according to the impedance transformation principle, the fan-shaped groove is used as a matching structure, so that the reflection of waves is reduced; the impedance matching is further improved by arranging the fan-shaped blocks, the insertion loss of the device is reduced, and the mode stability is improved; meanwhile, the loss caused by structure discontinuity is further reduced by adding the transition structure.
By adopting the novel matching structure, compared with a common circular truncated cone structure, the novel power divider further reduces the insertion loss, improves the isolation between branches, and has the greatest characteristic of improving the mode stability in large-size coaxial waveguides, thereby being beneficial to the stability of the performance of any multi-path coaxial power divider/combiner; meanwhile, the whole device adopts an all-metal structure, and high-power synthesis/distribution can be realized.
Drawings
Fig. 1 is a schematic diagram of a cavity structure of an N-way power divider/combiner according to the present invention.
Fig. 2 is a schematic diagram of a cavity structure of a matching unit of the present invention.
Fig. 3 is a cross-sectional electric field distribution diagram at the matching structure in the present embodiment, in which (a) is an overall electric field distribution diagram and (b) is a local electric field distribution diagram.
Fig. 4 is a simulation diagram of the S parameter of the power divider/combiner according to the embodiment.
The reference numbers illustrate: 1. the waveguide structure comprises a coaxial input waveguide, 2 standard rectangular waveguides, 3 fan-shaped grooves, 4 fan-shaped blocks, 5 transition structures and 6 transition waveguide structures.
Detailed Description
The present invention will be described in further detail with reference to the drawings and detailed description, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
In this embodiment, 12 coaxial TE channels with an operating frequency of 35GHz (corresponding to an operating wavelength λ of about 8.6mm) are used01For example, as shown in fig. 1, the power splitter includes a coaxial input waveguide, 12 transition waveguide structures, and 12 standard rectangular waveguides; one end of the coaxial input waveguide is used as an input port, 12 transition waveguide structures with the same size are arranged at equal intervals along the side wall at the other end of the coaxial input waveguide, and the other end of each transition waveguide structure is connected with a standard rectangular waveguide; 12 standard rectangular waveguides are used as output ports; the outer wall of the inner conductor of the coaxial waveguide is also hollowed to have 12 size phasesAnd the fan-shaped grooves are periodically distributed along the angular direction and correspond to the transition waveguide structures one by one.
TE is input from coaxial port P001The mode, after matching structure, is transformed into TE10The mode is distributed to 12 standard rectangular waveguide output ports (the standard rectangular waveguide adopts BJ 320).
Specifically, the inner radius b of the outer conductor of the coaxial input waveguide is 30.8mm, and the outer radius a of the inner conductor is 26.1 mm; central angle theta corresponding to sector groove112 degrees, and the thickness d1 of the fan-shaped groove is 4 mm; central angle theta corresponding to sector block37 degrees, the thickness d2 of the sector is 2mm, the height H1 of the sector groove is 7.6mm, the height H2 of the sector is 2.1mm, and the height of the transition structure is Ht; the device adopts an all-metal structure and is made of oxygen-free copper.
The simulation was performed using CST, and the electric field distribution at 3.556mm from the bottom of the coaxial waveguide (the end where the coaxial and rectangular waveguides are connected) after the matching structure was added is shown in fig. 3, and the S-parameter is shown in fig. 4. When the working frequency is 35GHz, TE is input coaxially01After the mode is output from the BJ320 through the matched 12-path power divider, the insertion loss is less than 0.3dB within 34.16-36.83GHz, and meanwhile, the isolation between output ports is also improved to a certain extent. The device has the characteristics of high power, low insertion loss and good mode stability, and has more remarkable advantages in large-size coaxial structures.
Claims (10)
1. Coaxial TE based on angular cycle matching01The mode power divider/synthesizer comprises a coaxial input waveguide, N transition waveguide structures and N standard rectangular waveguides, wherein N is more than or equal to 2; one end of the coaxial input waveguide is used as an input/output port, and the other end of the coaxial input waveguide is provided with N transition waveguide structures at equal intervals along the side wall; the N transition waveguide structures have the same size, and the other end of each transition waveguide structure is connected with a standard rectangular waveguide; the N standard rectangular waveguides are used as N output/input ports; the coaxial waveguide inner conductor is characterized in that N fan-shaped grooves with the same size are hollowed in the outer wall of the coaxial waveguide inner conductor, the N fan-shaped grooves correspond to the N transition waveguide structures one by one, and the symmetry plane of each fan-shaped groove is heavier than the symmetry plane of the corresponding transition waveguide structureAnd (6) mixing.
2. Coaxial TE based on angular period matching as claimed in claim 101The mode power divider/synthesizer is characterized in that the outer wall of the inner conductor of the coaxial input waveguide is provided with N fan-shaped blocks, and the fan-shaped blocks are arranged at the central positions of two adjacent fan-shaped grooves.
3. Coaxial TE based on angular period matching as claimed in claim 201The mode power divider/synthesizer is characterized in that a transition structure is connected to one bottom surface of the sector block, which is close to the input/output port of the coaxial input waveguide, and used for smoothly transitioning the bottom surface of the sector block to the inner conductor of the coaxial input waveguide, and the section of the transition structure in the radial direction is a right-angled triangle.
4. Coaxial TE based on angular period matching as claimed in claim 101A mode power divider/combiner, characterized in that said sector slots correspond to a central angle θ1The value range of the sector groove is 160 DEG/N +/-2 DEG, the thickness of the sector groove is 0.45 lambda-0.55 lambda, the height is 0.85 lambda-0.96 lambda, and lambda is the working wavelength.
5. Coaxial TE based on angular period matching as claimed in claim 2 or 301A modular power divider/combiner, characterized in that said sectors have corresponding central angles θ3The value range is 80 degree/N +/-2 degree, the thickness of the sector block is 0.2 lambda-0.25 lambda, the height is 0.85 lambda-0.96 lambda, and lambda is the working wavelength.
6. Coaxial TE based on angular period matching as claimed in claim 501A mode power divider/combiner, wherein the height of said transition structure is between 0.2 λ and 0.3 λ.
7. Coaxial TE based on angular period matching as claimed in claim 1 or 201Mode power divider/combiner, characterized by the waveguide axial length of said coaxial input waveguideAnd the inner radius of the coaxial input waveguide is smaller than the outer radius by 0.5 lambda-0.55 lambda, wherein lambda is the working wavelength.
8. Coaxial TE based on angular period matching as claimed in claim 1 or 201The mode power divider/synthesizer is characterized in that the arc length of a connecting port of the transition waveguide structure and the coaxial input waveguide is 0.86 lambda-0.96 lambda, the axial distance between two adjacent transition waveguide structures is 1.19 lambda-1.59 lambda, and lambda is the working wavelength.
9. Coaxial TE based on angular period matching as claimed in claim 1 or 201A mode power divider/combiner, wherein said rectangular waveguide has a length of at least 2 λ.
10. Coaxial TE based on angular period matching as claimed in claim 1 or 201The mode power divider/synthesizer is characterized in that the transition waveguide structure adopts a straight-side trapezoidal waveguide, a curved-side trapezoidal waveguide or a step waveguide.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011389829.7A CN112701435B (en) | 2020-12-01 | 2020-12-01 | Coaxial TE based on angular period matching01Modal power combiner/divider |
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| CN202011389829.7A CN112701435B (en) | 2020-12-01 | 2020-12-01 | Coaxial TE based on angular period matching01Modal power combiner/divider |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224493A (en) * | 2021-04-30 | 2021-08-06 | 电子科技大学 | N-path waveguide space radial power distribution combiner based on coaxial TE01 mode |
Citations (4)
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|---|---|---|---|---|
| CN102832432A (en) * | 2012-08-30 | 2012-12-19 | 北京遥测技术研究所 | Radial linear power divider/synthesizer |
| CN104134843A (en) * | 2014-07-18 | 2014-11-05 | 中国电子科技集团公司第四十一研究所 | Low-frequency broadband multi-channel coaxial space power distribution synthesizer and method |
| CN107732400A (en) * | 2017-08-31 | 2018-02-23 | 电子科技大学 | A kind of millimeter wave broadband ridge probe radial waveguide power divider/synthesizer |
| CN111755790A (en) * | 2020-06-19 | 2020-10-09 | 电子科技大学 | TE based on coaxial waveguide01Modulo arbitrary multi-path power divider/combiner |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832432A (en) * | 2012-08-30 | 2012-12-19 | 北京遥测技术研究所 | Radial linear power divider/synthesizer |
| CN104134843A (en) * | 2014-07-18 | 2014-11-05 | 中国电子科技集团公司第四十一研究所 | Low-frequency broadband multi-channel coaxial space power distribution synthesizer and method |
| CN107732400A (en) * | 2017-08-31 | 2018-02-23 | 电子科技大学 | A kind of millimeter wave broadband ridge probe radial waveguide power divider/synthesizer |
| CN111755790A (en) * | 2020-06-19 | 2020-10-09 | 电子科技大学 | TE based on coaxial waveguide01Modulo arbitrary multi-path power divider/combiner |
Non-Patent Citations (1)
| Title |
|---|
| KAIJUN SONG.ET.AL: "Planar Probe Coaxial-Waveguide Power Combiner/Divider", 《IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113224493A (en) * | 2021-04-30 | 2021-08-06 | 电子科技大学 | N-path waveguide space radial power distribution combiner based on coaxial TE01 mode |
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